I've been running 750cc injectors for a couple of years now, and of course the fuel economy computer is way off. This isn't a problem or anything, but is a major annoyance just knowing it is incorrect. Does anyone know of a way to calibrate it? Will an ecu reflash for 750cc injectors make it calculate correctly? I need to get the 7k rpm rev limit flashed out for the haltech anyway.

ross

 

Factory redline shouldn't effect haltech... I've been over factory redline with fcon for 6 years with no reflash.

Fuel economy is probably based on injector duty cycle. Since your haltech will never be running the same duty cycle your stock computer is, you're probably of luck. If you reflashed for your injector size it should get closer but youre not going to get it right on I bet.... I've never looked at how it works or how it's wired so take my opinion with a grain of salt.... I'm just basing this on how I'm assuming it works

 

Yeah i assumed it was calculated off of injector pulses or something, as the bigger the injectors got, the further off it was. I wish it wasn't lying to me though, 30+ MPG in town would be awesome
I just figured a reflash and setting the haltech to factory size injectors to compensate may take care of it. My utec would raise the rev limit over factory, but as far as i know the Haltech will not raise the rpm over factory limit without reflash.

ross

 

well, problem solved. Thanks Haltech!
the gauge was inaccurate when i had the e-manage and the utec.
with the haltech, fuel economy is dead on. I've calculated against the gauge 3 times in a row and each time it's within .05 mpg.
I assume the difference lies in the fact that the emanage and utec were interpolating the MAF signal and the haltech is strictly map with no maf correction set up.
Anyway, just an update.

ross

 

how exactly did you fix it?

 

ditched utec for haltech. probelm solved

 

I did the same thing, mine is still not close

 

nice